Yackpack is a social voice messaging service focused on ease of use — they bill themselves as being usable by children as young as three. Your contacts are represented visually in your "circle," and sending a voice message involves clicking on a friend (or clicking "send to all"), hitting record, speaking your message and hitting send. Your message then shows up in their message inbox. Nobody who is not in your circle of contacts can send you a message, thus avoiding spam.

As a web-based service, Yackpack avoids having to download a third-party client and keep it open and running on your desktop. I like the visual representation of your contacts and the ease of use aspect — I can see a lot of otherwise non-technical folks warming to this app. I can also see small groups finding uses for this, particularly groups who prefer voice or audio communication to plain text email.

[Via del.icio.us]